* {
    margin: 0px;
    padding: 0px;
}

body {
    display: flex;
    justify-content: center;
    align-items: center;

    background-color: #ddd;
}

div {
    border: 1px solid;
    display: inline-block;
    margin-bottom: 10px;
}

/* 并行选择器，意思是：请将大括号中的样式，同时应用于如下标签：table，th，tr，td */
table,
th,
tr,
td {

    border: 1px solid;
    border-collapse: collapse;

    padding: 5px;
}

.content {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;

    height: 400px;
    width: 600px;

    background-color: white;

    box-shadow: 1px 1px;
    border-radius: 20px;
}

.search {
    padding: 5px;
    display: flex;
    align-items: center;
}

th,
input[type=button] {
    background-color: #259dff;
}

input[value=删除] {
    background-color: rgba(245, 28, 28, 0.61);
}

input[name=keyword],
input[value=过滤] {
    margin-right: 5px;
}